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  • × author_ss:"Nelson, S.J."
  • × language_ss:"e"
  1. Nelson, S.J.; Powell, T.; Srinivasan, S.; Humphreys, B.L.: Unified Medical Language System® (UMLS®) Project (2009) 0.00 
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    Abstract
    The Unified Medical Language System (UMLS) is a long-term research and development effort of the National Library of Medicine, aimed at assisting users in finding information from multiple sources without understanding the intricacies of each particular source. Consisting of three major knowledge sources, a Metathesaurus, a Semantic Network, and a set of lexical processing tools, the UMLS is produced and released twice yearly. Recent efforts have been aimed at expanding coverage in genetics and in clinical vocabularies designed for use in medical record systems. RxNorm, produced and released on a monthly basis, with weekly updates, is an outgrowth of the UMLS, focusing on medication terminology.
    Type
    a
  2. Nelson, S.J.: From meaning to term : semantic locality in the UMLS metathesaurus (1992) 0.00 
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    Type
    a
  3. Nelson, S.J.; Johnston, W.D.; Humphreys, B.L.: Relationships in Medical Subject Headings (MeSH) (2001) 0.00 
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    Abstract
    Recent efforts to make some of the relationships within McSH more explicit have led to a deeper understanding of the nature of these relationships. This chapter will explore the relationships represented in McSH in the light of that understanding. Every term that occurs may be thought of as representing a concept. One or more terms, comprising one or more concepts, grouped together for important reasons, form a descriptor class. The descriptor class is the basic building block of the thesaurus. Relationships among concepts can be represented expiicitly in the thesaurus, most notably as relationships within the descriptor class. Hierarchical relationships are at the level of the descriptor class. The hierarchies are key in allowing expanded retrievals. The hierarchical relationships, traditionally thought of as broader or narrower (parent-child) relationships, are better understood as representing broader and narrower retrieval sets. Nevertheless, these hierarchical relationships often reflect important broader-narrower relationships between preferred concepts in descriptor classes. Other types of relationships present in the thesaurus include associative relationships, such as the Pharmacologic Actions or see-related cross references, as well as forbidden combination expressions, such as the Entry Combination.
    Type
    a
  4. McCray, A.T.; Nelson, S.J.: ¬The representation of meaning in the UMLS (1995) 0.00 
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    Abstract
    The Unified Medical Language System knowledge source provide detailed information about biomedical naming systems and databases. The Metathesaurus contains biomedical terminology from an increasing number of biomedical thesauri, and the Semantic Netowrk provides a structure that encompasses and unifies the thesauri that are included in the Metathesaurus. Addresses some fundamental principles underlying the design and development of the Metathesaurus and Semantic Network. Describes the formal properties of the semantic network. Considers the principle of semantic locality and how this is reflected in the UMLS knowledge sources. Discusses the issues involved in attempting to reuse knowledge and the potential for reuse of the UMLS knowledge sources
    Type
    a

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